固相剪切碾磨制备聚甲醛/聚氧化乙烯/二硫化钼复合材料的形貌与力学性能和摩擦磨损性能

Morphology, Mechanical Performance and Tribological Property of Polyoxymethylene/Polyethylene Oxide/MoS2 Composites Prepared Through Solid-State Shear Milling Technology

采用固相剪切碾磨(S^3M)技术制备了聚甲醛/聚氧化乙烯/二硫化钼(POM/PEO/MoS2)复合粉体和材料,且进一步采用扫描电子显微镜、万能材料试验机、热失重分析仪、摩擦磨损测试仪测试和研究其形貌、粒径分布、力学性能、热稳定性和摩擦磨损性能。实验结果表明,在磨盘碾磨强大的三维剪切力场作用下,增韧改性剂PEO和MoS2填料粒子在POM基体树脂中分散均匀,所得复合粉体粒子尺寸达到微米级。PEO改性剂的引入和磨盘碾磨的共同作用可有效提高POM的冲击性能,同时PEO通过对MoS2粒子的包覆有效解决了POM热稳定性低和难以加工的问题。此外,磨盘碾磨作用下,PEO与MoS2的结合还明显降低了POM的摩擦系数和损耗量,赋予所得POM/PEO/MoS2三元复合材料优异的自润滑和摩擦磨损性能。

Solid-state shear milling(S^3M)technology was used to prepare polyoxymethylene/polyethylene oxide/molybdenum disulfide(POM/PEO/MoS2)co-powders and composites.Then,scanning electronic microscope(SEM),universal material testing machine,thermogravimetric analyzer(TGA)and friction wear tester were further used to investigate the corresponding morphology,particle size distribution,mechanical performance,thermal stability and friction and wear properties.The experimental results show that,under effect of the strong three dimensional shear force field during pan-milling,the PEO modifier and MoS2 filler particles are uniformly dispersed in the POM matrix and the size of the co-powder decreases to the micrometer level.The co-effect of the introduced PEO modifier and pan-milling could effectively improve the impact property of POM.In the meantime,the encapsulation of MoS2 particles with PEO also effectively solves the problems of the low thermal stability and degradation of POM during processing.In addition,the combination of PEO and MoS2 could significantly reduce the friction coefficient and wear volume of POM,endowing the obtained POM/PEO/MoS2 ternary composite with excellent self-lubrication and friction performance.